For You have put us to the test, God; You have refined us as silver is refined. You brought us into the net; You laid an oppressive burden upon us. You made men ride over our heads; We went through fire and through water. Yet You brought us out into a place of abundance. Psalm 66:10-12, NASB
How long?
How long, O you sons of men,
Psalm 4:2-3
Will you turn my glory to shame?
How long will you love worthlessness
And seek falsehood?
But know that the LORD has set apart for Himself him who is godly;
The LORD will hear when I call to Him.
Mercy in the heavens
"Your mercy, O Lord, is in the heavens; Your faithfulness reaches to the clouds. Your righteousness is like the great mountains; Your judgements are a great deep; O Lord You preserve man and beast."
Psalm 36:5-6

Remember
This is the day the LORD has made;
Psalm 118:24
We will rejoice and be glad in it.
Our delight
Blessed is the man Who walks not in the counsel of the ungodly, Nor stands in the path of sinners, Nor sits in the seat of the scornful; But his delight is in the law of the LORD, And in His law he meditates day and night. He shall be like a tree Planted by the rivers of water, That brings forth its fruit in its season, Whose leaf also shall not wither; And whatever he does shall prosper. Psalm 1:1-3
Perfection
Allegri’s setting of Psalm 51, a prayer of repentance
Perfect hatred
Oh, that You would slay the wicked, O God! Depart from me, therefore, you bloodthirsty men. For they speak against You wickedly; Your enemies take Your name in vain. Do I not hate them, O LORD, who hate You? And do I not loathe those who rise up against You? I hate them with perfect hatred; I count them my enemies. Search me, O God, and know my heart; Try me, and know my anxieties; And see if there is any wicked way in me, And lead me in the way everlasting. Psalm 139:19-24